Stepper bike



FIG. 1 is a front perspective view of the stepper bike of my design;

FIG. 2 is a rear perspective view thereof;

FIG. 3 is a side elevational view of the stepper bike of FIG. 1 in an upright standing position;

FIG. 4 is a top plan view thereof;

FIG. 5 is a front elevational view thereof;

FIG. 6 is a rear elevational view thereof;

FIG. 7 is a side elevational view of the left side thereof;

FIG. 8 is a side elevational view of the right side thereof; and,

FIG. 9 is a bottom plan view thereof. 

I claim the ornamental design for a stepper bike, as shown and described. 